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Please try the following steps:
Step 1. Delete registry key.
1)Press Win + R to open a run box.
2)In the Run box, type regedit, and then click OK.
3)Locate the following registry subkey:
4)Right-click the subkey that you located in step 2. Then, click Delete.
5)When you are prompted to confirm the delete operation, click Yes.
6)On the File menu, click Exit to exit Registry Editor.
7)Log off the computer. Then, log on to the computer.
Step 2. Extend your display by changing display settings.
1)Open Screen Resolution by clicking the Start button , clicking Control Panel, and then, under Appearance and Personalization, clicking Adjust screen resolution.
2)Click the drop-down list next to Multiple displays, click Extend these displays, and then click OK.